SBCL is quite fast for a lot of things. I used to use it frequently for research projects that required performant code, and it generally wasn't to difficult t

SBCL is quite fast for a lot of things. I used to use it frequently for research projects that required performant code, and it generally wasn't to difficult to get within a factor of 2 of c code, though getting much closer could be hard. I haven't really kept up with it recently, but it regularly impressed me at the time.